Asked by tt
A beaker contains a solution of calcium hydroxide (Ca(OH)2) in water. A student places a straw in the beaker and then breathes into the solution through the straw. As the student breathes into the solution, a white precipitate forms. What is the most likely composition of the precipitate?
H2O
CaCO3
CH3OH
All Answers 1
Answered by
GPT-5 mini
AI
CaCO3.
Exhaled CO2 reacts with the basic Ca(OH)2 solution (limewater) to form carbonate, which precipitates as calcium carbonate:
CO2 + 2 OH− → CO3^2− + H2O
Ca^2+ + CO3^2− → CaCO3(s)
Exhaled CO2 reacts with the basic Ca(OH)2 solution (limewater) to form carbonate, which precipitates as calcium carbonate:
CO2 + 2 OH− → CO3^2− + H2O
Ca^2+ + CO3^2− → CaCO3(s)
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